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Seasonal radiogenic isotopic variability of the African dust outflow to the tropical Atlantic Ocean and across to the Caribbean

机译:季节性辐射性同位素变异,非洲尘埃流出到热带大西洋和跨越加勒比海

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摘要

In order to assess the impact of mineral dust on climate and biogeochemistry, it is paramount to identify the sources of dust emission. In this regard, radiogenic isotopes have recently been used successfully for tracing North African dust provenance and its transport across the tropical Atlantic to the Caribbean. Here we present two time series of radiogenic isotopes (Pb, Sr and Nd) in dusts collected at the Cape Verde Islands and Barbados in order to determine the origin of the dust and examine the seasonality of westerly dust outflow from Northern Africa. Aerosol samples were collected daily during two campaigns - February 2012 (winter) and June-July 2013 (summer) - at the Cape Verde Atmospheric Observatory (CVAO) on the island of Sao Vicente (16.9 degrees N, 24.9 degrees W). A one-year-long time series of aerosols from Barbados (13.16 degrees N, 59.43 degrees W) - a receptor region in the Caribbean - was sampled at a lower, monthly resolution.
机译:为了评估矿物粉尘对气候和生物地球化学的影响,识别粉尘排放来源至关重要。 在这方面,最近已经成功地用于追踪北非尘土物质及其对热带大西洋的运输来追溯到加勒比地区的辐射性同位素。 在这里,我们在Cape Verde岛和巴巴多斯收集的粉尘中呈现了两次辐射同位素(PB,SR和ND),以确定灰尘的起源,并从北非审查Westerly尘埃流出的季节性。 每天在两次竞选期间收集气溶胶样品 - 2012年2月(冬季)和2013年6月(夏天) - 在圣维森特岛的佛得角大气天文台(Cvao)(16.9度,24.9度W)。 从巴巴多斯(13.16度N,59.43度W) - 加勒比地区的一年长时间的气溶胶(13.16度N,59.43度) - 以较低的每月分辨率进行采样。

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